There's a very popular phrase in the mocap space called monkey butt.

在动作捕捉领域有一个非常流行的短语叫做“猴子屁股”。

And that is the hips kind of jut back a little bit and it kind of looks like they have a monkey butt.

也就是臀部有点向后翘，有点像猴子的屁股。